Warning stand



FIG. 1. is a top, front right side perspective view thereof;

FIG. 2. is a front elevational view thereof;

FIG. 3. is a rear elevational view thereof;

FIG. 4. is a left plan view thereof;

FIG. 5. is a right plan view thereof;

FIG. 6. is a top plan view thereof;

FIG. 7. is a bottom plan view thereof; and,

FIG. 8 is a perspective view thereof, with the claimed design shown in closed condition. 

The ornamental design for a warning stand, as shown and described. 